Chapter 1

The key felt heavier than usual in my hand as I stood outside our front door. Three days in Chicago had felt like three weeks, and all I wanted was to collapse into Mark's arms and forget about the disastrous client meeting that had ended a day early.

I pushed the door open quietly, not wanting to wake him if he was still asleep. The house felt different somehow—charged with an energy I couldn't quite place. My heels clicked softly against the hardwood as I made my way through the living room, noting the wine glasses on the coffee table, the throw pillows scattered on the floor.

Mark must have had someone over. Probably his brother again, drinking too much and making a mess.

I climbed the stairs, each step bringing me closer to the sanctuary of our bedroom. The door was slightly ajar, and I could hear movement inside—soft rustling, quiet murmurs. My heart lifted. He was awake.

"Mark?" I called softly, pushing the door open with a smile already forming on my lips.

The smile died instantly.

Time seemed to fracture, splintering into a thousand sharp pieces that cut through my consciousness. On our bed—our bed with the Egyptian cotton sheets I'd picked out for our anniversary—two figures were entwined in a way that made my stomach lurch.

Mark's familiar broad shoulders, the mole on his left shoulder blade that I'd kissed countless times. But beneath him...

My breath caught in my throat like a trapped bird.

The woman's face was turned toward me, flushed and breathless, her dark hair spread across my pillow like spilled ink. For a moment, my brain refused to process what I was seeing. The features were so familiar, yet subtly wrong—like looking at myself in a funhouse mirror.

Lisa.

My twin sister Lisa, but not quite. Her nose was different—straighter, more refined than the one we'd shared since birth. Her lips were fuller, more defined. The cheekbones sat higher, creating shadows I'd never seen on her face before. It was like seeing a perfected version of myself, an upgraded model that made my chest tighten with recognition and revulsion.

The plastic surgery she'd gotten six months ago. The "minor tweaks" she'd dismissed when I'd asked about her changed appearance at Mom's birthday dinner.

Now I understood why she'd looked so different. Why she'd avoided meeting my eyes that night.

"Oh God," I whispered, the words scraping against my throat like broken glass.

Mark's head snapped up, his face cycling through confusion, shock, and something that might have been guilt. His hair was disheveled, his lips swollen, and for a moment he looked like a stranger wearing my husband's skin.

"Mia," he breathed, scrambling to pull the sheet over both of them. "You're not supposed to be—"

"Home?" The word came out as a croak. "I'm not supposed to be home?"

Lisa sat up slowly, her movements deliberate and careful. She didn't look surprised. She didn't look ashamed. If anything, there was a calculating coolness in her eyes that made my blood turn to ice.

"Hello, sister," she said, her voice steady despite her nakedness. "You're early."

The casual tone, as if we'd bumped into each other at a coffee shop instead of... this. My legs felt unsteady, and I gripped the doorframe to keep from falling.

"How long?" The question fell from my lips before I could stop it.

Mark and Lisa exchanged a look—quick, practiced, intimate. The kind of look that spoke of shared secrets and private jokes. The kind of look I thought belonged to Mark and me.

"Mia, let me explain—" Mark started, but I held up my hand.

"How long?" I repeated, my voice gaining strength even as my world crumbled.

Lisa tilted her head, studying me with those newly sculpted features. "Does it matter? You were never really here anyway. Always traveling, always working. Mark needed someone who could actually be present."

The words hit me like physical blows. Each one carefully chosen, precisely aimed. This wasn't a moment of weakness or a mistake born of alcohol and poor judgment. This was deliberate. Calculated.

Planned.

"Six months," Mark said quietly, his eyes fixed on the rumpled sheets. "Since... since she got back from the surgery."

Six months. Half a year of lies, of coming home to kisses that tasted of betrayal, of sleeping next to a man who was thinking of my sister. My stomach churned, and I pressed my hand against my mouth to keep from being sick.

"The business trips," I whispered, pieces clicking into place like a jigsaw puzzle of pain. "You always knew my schedule."

Lisa shrugged, the movement casual and devastating. "You made it easy. Always so organized, so predictable. Mark would text me your itinerary, and we'd plan accordingly."

The room spun around me, the familiar space suddenly alien and hostile. Our wedding photo on the nightstand seemed to mock me, two smiling faces from a time when I believed in forever. The scent of Lisa's perfume—the same one I wore—hung heavy in the air, mixing with the unmistakable musk of sex.

I wanted to scream. I wanted to tear the sheets from their bodies and demand explanations, apologies, something that might make sense of this nightmare. Instead, I found myself backing toward the door, my body moving on autopilot while my mind struggled to catch up.

"Mia, wait—" Mark started to rise from the bed.

"Don't." The word came out sharp and final. "Just... don't."

I turned and walked away, my legs somehow carrying me down the stairs and out the front door. Behind me, I could hear Mark calling my name, but his voice seemed to come from very far away, like an echo from another life.

The cool evening air hit my face, and I realized I was crying. When had that started? My hands shook as I fumbled for my car keys, the simple act of unlocking the door feeling monumental.

As I sat in the driver's seat, staring at the house that was no longer home, one thought echoed through the chaos in my mind:

My husband was sleeping with my sister. My twin sister who had changed her face to look like a better version of me.

And somehow, that felt like the cruelest betrayal of all.